This 0.9 carat Round
has a face-up area of approx. 30.97 mm², which
falls within the normal range for 0.9ct
Rounds.
A face-up area is the area of the girdle plane and tells
you how big the stone looks when viewed from the top (as set in a ring).
Face-up size of this diamond is as you would expect of a 0.9ct Round → learn more

Actual Diamond Size

Here you can see how big 0.9 carat diamond
(6.28×6.28×3.79mm) actually is and how it
would appear on a ring and finger.
Adjust the ring and finger size to get an idea of how it
would look on your finger. To choose another diamond or to change diamond parameters
click here.

To see how this 0.9 carat Round
(6.28×6.28×3.79mm) compares
to other diamonds, click here.

Buying Guide: Round cut

Round brilliants are very good at masking inclusions and color, which means you can go quite low in terms of clarity and color grades without sacrificing the appearence. Cut, on the other hand, which determines the fire and brilliance should always be of the highest possible grade (Excellent for GIA or Ideal for AGS).

What's the price of a 0.9 carat diamond?

It depends. The value of a diamond is determined by a combination of its unique characteristics - the famous 4Cs (Cut, Color, Clarity, and Carat). It can get complicated, but you can quickly check the price range for Round diamonds of around 0.9 carats by clicking here »

The search results will show you diamonds from 0.85 to 0.95 carats with all the recommended parameters already preselected in order to give you the best value.

Online-only stores will always offer better prices compared to bricks & mortar stores, their
main drawback, however, is that you rarely get the opportunity to visually inspect the diamond
before purchasing. Luckily, this is not always the case. A few reputable online retailers
(see above) are now providing actual Hi-Res photos of the diamonds
they're selling, making it easy and safe to shop online. For best value, buy online.

Note: Seeing a high quality photo of the actual diamond before purchasing online is a must.

Additional Diamond Info

Round Brilliant is the ultimate classic and the most popular of all diamond shapes. It is designed to produce maximum fire, brilliance, and scintillation (sparkle). It has evolved over several hundred years and is the most researched and scientifically analyzed cut in the industry. Simple, timeless, and beautiful.

General size appearance:

Round Brilliants typically look larger when viewed from the top compared to Princesses, Emeralds, Asschers, Radiants, and Cushions.

Depth percentage for 0.9 carat
Round
(6.28×6.28×3.79mm)

Depth percentage of Round cut is the ratio of the total depth (measured from table to culet)
to its average diameter. The total depth percentage of this diamond
is 60.4%, which is OK.

Depth percentage for rounds is calculated with the following formula:

Depth % = (total depth ÷ average diameter) × 100

0.9 carat
Round
(6.28×6.28×3.79mm) depth %:

Total depth: 3.79 mm
Average diameter = (6.28 + 6.28) ÷ 2 = 6.28 mm

Depth % = (3.79 ÷ 6.28 ) × 100 = 60.4%

About Depth Percentage

Depth percentage is one of the most important measurements as it plays a critical role in diamond's
brilliance and appearance. If a diamond is cut too deep or too shallow, light leaks out, making
the stone less brilliant and fiery. Deep cuts also add hidden weight.

Recommended depth percentage range for Round cuts
is between 58% and
62.5%.
Diamonds that fall out of this range are generally less desirable and
usually best to be avoided.

Face-up size evaluation for 0.9 carat Round
(6.28×6.28×3.79mm)

The face-up size of this 0.9 carat Round
(6.28×6.28×3.79mm) is within the normal range for
0.9ct diamonds of this shape.
Compared to 0.9ct
Round reference diamond (see below), this diamond is of adequate
size when viewed from the top. In short, all is OK, this diamond looks its weight.

The importance of face-up size

Diamonds are sold by weight (carats), but it's important to understand that
weight doesn't equally translate into physical size, especially spread. Two
diamonds of the same carat weight can vary greatly in spread, meaning that one
diamond can appear larger than the other, even though they weight exactly the same.

Proper face-up size should play an important role when buying a diamond.
When a diamond is set in a ring, your eyes will only see the face-up area,
so you should make sure it's of adequate size. Adequate size also indicates a good cut, meaning better light performance. Would you want a poorly cut 0.9 carat diamond that is less sparkly and has the same face-up size as an ideal cut 0.8 carat? Probably not.

The bottom line:
A diamond must look its weight. This one does. Thumbs up.

0.9 carat Round reference diamond

0.9ct Round reference diamond is calculated from the following ideal proportions:

Proportions:

Table:

57%

Crown angle:

34°

Pavilion angle:

40.7°

Girdle:

2.8%

Star length:

50%

Lower half-length:

80%

Culet:

None

Calculated values:

Depth:

60.3%

Crown height:

14.5%

Pavilion height:

43%

For 0.9 carat weight:

Diameter:

6.28 mm

Face-up area:

30.97 mm²

Note: Round diamonds with face-up area of within 5% lower
and 3% higher than reference Round diamond area
are considered to be of adequate face-up size.

Face-up Area For Rounds

Face-up area is a measure of the size of the diamond when viewed from above.
It tells you how big the diamond is at the girdle plane. It's important for a diamond to have
sufficient face-up size for its carat weight.

Face-up Area per Carat

Face-up area per carat is calculated by dividing face-up area of the diamond with
its carat weight. It tells you how many square millimeters of the top surface area
a diamond is showing or would show for 1 carat weight. This can be useful when comparing stones
of similar weights as it tells you how much spread per carat you will get.

Note: Face-up size does not linearly grow with carat weight,
which means the heavier the stone, the smaller its face-up area per carat (e.g., 1ct stone will have
higher face-up area per carat than 2ct stone).

Face-up area per carat for 0.9ct Round (6.28×6.28×3.79mm):

Top surface area = 30.97 mm²Weight = 0.9ct

Face-up area per carat = 30.97 ÷ 0.9 =
34.41mm²/ct

Color Recommendation For 0.9ct Round

Round Brilliants don't show color as much as other cuts, so you can go quite a few steps down on the color scale without noticing any difference. The choice of color also depends on a setting:

Solitaire

Small side-stones

Substantial side-stones

White gold/Platinum

J+

I+

same as side-stones+

Yellow gold

K+

J+

same as side-stones+

e.g. pave setting

e.g. three-stone setting

Note: If side-stones are of any
significant size (like in three-stone settings), you should at least match the color of
the center stone with the color of the side stones,
otherwise the center stone might look out of place (a bit "off-white").

For best value, go with the minimum recommended color for a particular type of setting.
Color variations between J graded and higher colored
Round cuts are so slight that it's almost impossible to
tell the difference, especially when diamonds are mounted.
The difference in price, however, can be quite considerable.

Clarity Recommendation For 0.9ct Round

Round Brilliants are great at masking inclusions, so you can go relatively low on clarity scale without sacrificing the appearance, as long as the diamond is eye-clean. SI1 or SI2 clarity offers great value for money.

Note: You can always go lower in clarity, but it's going to
get increasingly difficult to find an eye-clean Round below
the minimum recommended SI2 grade.

For best value, go with the lowest clarity possible that is still eye-clean.
If a diamond is eye-clean, it doesn't matter, if it's flawless or
SI2.
It will look the same, provided all other characteristics are the same.

About Diamond Clarity

Diamond clarity refers to the presence and visual appearance of the flaws inside a diamond (called inclusions)
or on its surface (called blemishes). Clarity tells you to what degree these imperfections are present.

The amount of inclusions and blemishes is directly correlated to a diamond's value. Fewer imperfections
mean higher price and vice versa.

Gemological laboratories grade diamond clarity as Flawless (FL), Internally Flawless (IF),
Very Very Slightly Included (VVS1,VVS2), Very Slightly Included (VS1,VS2),
Slightly Included (SI1,SI2), and Included (I1,I2,I3).

GIA and AGS Certified Diamonds

Professional and unbiased assessment of diamond characteristics is stated on a diamond grading report,
commonly referred to as a certificate. Certificate, while not 100% reliable, is
essential in determining a diamond's value.

The standard for diamond grading is pretty much set by GIA - Gemological Institute of America.
They are the most reputable and consistent lab in the industry. AGS (American Gemological Society)
is not far behind.

If a diamond is not certified by GIA or AGS, you can be pretty much certain that you are looking at
lesser quality than indicated. This puts you in a bad position of not knowing the true diamond characteristics,
which almost always results in overpaying.
That is why a certificate from a well-respected grading lab is so important.

The bottom line: Make sure to always buy a diamond certified by either GIA or AGS.
That's the only way of truly getting the quality you expect.

Diamonds with Blue Fluorescence

Blue fluorescence can have a positive, negative, or zero effect on a diamond. Diamonds in the
lower color range (H or lower) can benefit from it, as it can make them look whiter, more colorless.
On the other hand, strong fluorescence can cause a stone (especially in the higher color range D-G) to
appear hazy or milky under certain light conditions. One of the biggest benefits of
fluorescent diamonds is that they generally cost less.

Faint fluorescence will have zero effect on color and overall appearance.
Fluorescence of this type is not an issue and shouldn't be a purchasing factor.

Medium fluorescence will in most cases have zero to very small influence on color
and overall appearance, however, colorless diamonds can sometimes
exhibit negative effects and should be examined in
different light conditions before purchasing.

Strong/Very Strong fluorescence requires caution.
Generally, it's not a good idea to buy a colorless diamond with Strong/Very Strong fluorescence.
As for lower color
diamonds, even they can sometimes look hazy with strong fluorescence, so never buy a stone with
this type of fluorescence without careful visual inspection.

If you're interested in fluorescent diamonds that have been carefully examined and do not
display any negative effects of fluorescence, I recommend
Brian Gavin's Blue Diamonds. Those are definitely top of the line and a great value.

Diamonds Without GIA or AGS Certificates

The problem with diamond grading labs other than GIA or AGS is that they are looser
and more inconsistent in their grading standards.
A GIA color H is an IGI color G and an EGL/HRD color F. The same goes for clarity.

While it's true that IGI, EGL, and HRD diamonds are sold at a discount, you can be certain
that the same stones would cost less, if they would be certified by GIA or AGS. Why?
Because they would get lower grades and thus lower price. Lower than discounted IGI, EGL,
and HRD stones with higher grades.

Diamond merchants use IGI, EGL, HRD, and alike to maximize their profits. They know they can
sell diamonds with inflated grades for more, even if they're sold at a substantial discounts.
Some merchants also use their in-house certification, usually for the sole purpose of increasing
their profits. These kinds of certificates are meaningless.

The bottom line: If you don't want to overpay and want to know exactly what kind of quality you're
getting, then avoid diamonds without GIA or AGS certification.

Buying shy

Buying shy means choosing a diamond that falls just under the full-carat or half-carat mark.
So instead of 1ct stone you go for 0.95ct; instead of 1.5ct you go for 1.4ct, and so on.

Because diamond prices jump dramatically at full-carat and half-carat weights,
you can save a considerable amount of money when buying shy.
Going up to 10% down in weight will result in a slight difference in size, but so slight
it'll barely be noticed, if at all. To check this for yourself, use this site to compare different sizes.